Hello! If you don't know how to do the mirror effect I'll teach teach you how to!
Here are 10 steps on how to change this:

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to this:

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Using mirror effect.
Feel free to ask questions if you need help with anything.

Mirror Effect!

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1.

2.

3.

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9.

10. Final Work!

And your done!

On the duplicate layer, i clicked on the eye thing and the background didn't disappear. how do you exactly do it?

the layers look the same so it looks like it's not gone just ignore the background layer you won't be using it.

On step 7, how did you merge those two pictures. when i did it, i dragged copy 2 and it said that "Could not complete your request because source and destination documents are the same." That's what it said.